关键词: 农牧交错带, 气候变化, 土地利用

Abstract: The farming grazing transitional zone of northern China had once been a region where the primitive agricultural culture was developed and flourished.The agricultural culture declined and changed to the pastoral culture during cal.4300～3500aBP.After than,the so called farming grazing transitional zone formed,and the relative strength of the agricultural culture and pastoral culture has changed in the course of history in the region.The process of culture changes mentioned above was strongly impacted by the climatic changes.The primitive agriculture developed in the Holocene Megathermal Period when temperature was 2～3℃ higher in a maximum,and annual precipitation was about 100mm more than the present.The decline of agricultural culture and the rise of pastoral culture happened at the termination of the Holocene Megathermal Period when both temperature and precipitation dropped,which induced inadequate thermal and water resources for agricultural production. The formation of farming grazing zone during the last 3500 years convinced with the modern climate system.The time and the possible cause of the decline of primitive culture in farming grazing transitional zone of northern China is comparable with the decline of the ancient cultures in India,Babylon,and Egypt,which implies some inner interrelationship in climatic changes in the above regions.

Key words: transitional zone, archaeological culture, land use